ISEE-1 and -2 observations of magnetic field strength overshoots in quasi-perpendicular bow shocks

Details ISEE-1 and -2 observations of magnetic field strength overshoots in quasi-perpendicular bow shocks ISEE-1 and -2 observations of magnetic field strength overshoots in quasi-perpendicular bow shocks

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9.1037l&link_type=abstract

Geophysical Research Letters, vol. 9, Sept. 1982, p. 1037-1040.

Physics

40

Bow Waves, Geomagnetism, Magnetic Flux, Magnetohydrodynamic Waves, Solar Terrestrial Interactions, International Sun Earth Explorers, Solar Wind

Scientific paper

According to the Rankine-Hugoniot jump conditions, the magnetic field strength increases in passing from upstream to downstream of a magnetohydrodynamic shock. At the earth's bow shock the magnetic field often increases significantly more than is required by the Rankine-Hugoniot conditions before decaying in an oscillatory fashion to its downstream average value. Recent OGO-5 and ISEE studies, together with the realization that overshoots also occur in the bow shocks of Venus, Jupiter, and Saturn have focussed attention on these phenomena. It is found that none of the nonlinear dispersive wave theories in the shock literature can account for the overshoot. The present investigation documents the dependence of the overshoot amplitude and thickness on solar wind parameters. Magnetic field overshoots are found to be characteristic of supercritical quasi-perpendicular shocks. The overshoot thickness scales as the ion Larmor radius based upon the solar wind speed and magnetic field.

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